Piston packing



July 7, 1925. 1,545,275

J. F. PANYARD A RNEY a 5 2 mu July 7, 1925.

v 1,545.215 J. F. PANYARD 2 Sheets-Sheet 2 INVENTOR.

ATTORNEY.

Patented July '7, 1925- v UNITED STATES PATENT. ornca.

Joan r. rmann, or nn'rnon mcnrcm. I

' PISTON. PACKING.

Application filed October a, 1923. serial he; seems.

To all whom it may concern."

Be it known that I, J oHN F. PaNx Rn, 1a

citizen of the United States, residing at Be troit, county of Wayne, State of Michigan, have invented a certain new and useful Improveme'nt in Piston Packings, and declare the following to be a full, clear, and exact which the piston is working, assist the lubrication without pumping the lubricant, and

accomplish these results without undue wallpressure against the cylinder, and in addition the packing should stabilize thepiston in the cylinder and prevent what is commonly termed piston slap, and therefore, it

is desirable that the packing, while adjustable to fit the diameter of the cylinder, seat firmly at all times against the piston.

Itjhas heretofore been the practice to pro vide packing rings disposed in peripheral packing receiving grooves 1n. the piston held .yieldingly outwards against the cylinder wall either by inherent or auxiliary spring tension or by gas expansion. Some construe: tions were of such a character that the packing was also. held axially against the side ,walls of the groove. Such constructions not only call for play of the packing relative the piston'butpro'vide a resilient medium intervening the piston and packing to hold the latter yieldingly outwards against the cylinder wall and may becharacterized as employing a piston having a yielding seat for the packin which seat is commonly in the form 0 an auxiliary spring intervening the piston and packing but may consist of a layer of expansive gases between the packing and piston. or reside in the inherent expansive character 9f the packing rings.

I provide a' packin adjustable relative the piston to fit the ore of the cylinder, yet seated firmly radially andaxially-against the piston'to stabilize its 0 eration m the cylinder. It is a purpose o my invention I to provide a iston with a rigid supporting seat for packing, which packmg is movable for adjustment to the bore, of the cylinder eled helical side wall portion.

but upon which it is firmly seated at all times, and an important object is the provision in a piston of a packing groove hav ing. a ri id seating face for the packing over which t 'e'pacln'ng may travel radiall and axially to,, compensate for varying cy mder bore dimensions.

' A meritorious feature of construction is the employment in a piston of a packing groove having a rigid tapered beveled seat-.

ing face for packing upon which is vfirmly yet adjustably seated a suitable packing ring having a helical beveled face contactin the beveled face of the groove, said ring I he d yieldingly against the cylinder wall while seating firmly againstthe supporting face of the p ston. v

In the drawings,

5 'Fi ure 1 is aside elevation of the piston provided with my improved packing.

. Fig. 2 is a cross-sectional view'taken on line 2--'2 of'Fig. 1

Fig. 3 is a fragments. view taken on'line 33 0 Fig. 1.

Fig. 4 isa fragmentary cross-sectional view taken on line 44, Fig. 2.

Fig. 5 is a' horizontal sectional view .through a piston provided with my improved packing.

vertical sectional i Fig. 6 is a s de elevation of one form of my improved packing ring. v

Fig. 7 is a fragmentary side elevation of a piston carrying a modified form of my packing.

" Fig. 8 is a cross-sectional view taken. on

line 88 of Fig. 7.

Fig. 9 is a fragmentary sectional view through-a piston carrying another. modified form of my acking.

In the drawings, let 20 indicate a cylinder wall and 21 a piston disposed to work in the cylinder. This piston is provided with peripheral packing grooves 22 of the form usually provided exce t that the acking groove is provided wit an outwar ly bev- In Fig. 3 the bevel of the side wall ortion. is clearly indicated at 23. This beve ed side wall may be helical throughout its entire length as would be the case ifthe ring shown in Fig. 6

were em loyed or it may consist'of a plurality o tapered steps 24, as is illustrated in Fig. 1. V I

I rovide a packing ring 25 with a bev-. eled helical inner face 26 to seat on the beveled-side wall of the groove to support the ring radially and axially. The ring, ofcourse, is beveled and tapered to correspond with the bevel and taper of the side wall of the groove and is illustrated as a one-piece resilient split ring section.

In Figs. 1 to 6, I have shown the packing .as'comprising a single ring section consisting of a packing ring having either a single he ical face or a'-succession of stepped helical faces. Inthese views I have shown two types of springs adapted to'exert rotatable pressure on 'the pee helical face thereof to hold t e rinlg to fill the groove axially at all times. 11 Figs. 2 and 4, I show-a coil' spring 27 secured at one end to the piston and engaging at the 3 opposite end-inthe split 28 of the ring to exert rotatable pressure thereon-counter the tapered .face of the rings. In Fig. 5, I show a spring 29 coiled about the piston in the bottom of the groove underneath the ring 25 and turned inwardly at one end as at 30 into a notch in the bottom of the groove and outwardly at the other end as at 31 into the split of the ring to exert rotatable pressure on the ring.

Thering is of such a cross-sectional dimension as to substantially fill the gap ofthe groove in the piston and to extend outwardly beyond the outer face of the piston to contact the cylinder wall.- The rmgis' rigidly supported axially and radially blyl the piston while contacting the cylinder we and the opportunity for relative movement which might result in-pistonslap is reduced to a minimum. y In Figs. 7 and 8, I have illustrated my invention as embodied'in a construction suitable for disposition in the conventional straight side packing groove. Toobtain the result illustrated in the constructions shown in the first five figures of the drawings, I provide in the groove, an annular member 32 having an outwardly beveled helical face 33 which "member is rigidly secured in the groove in 'a suitable manner as by means of a pin 34. This provides a firm beveled hehcal side wall within the groove co 0nding to.t'he side wall 23.illustrated in 3, upon which the correspondingly bevele inner face of the ring section 25 seats to provide a support for the ring. In Fig. 9 my packing ring is constructed in two sections, a large section 35 which corresponds to the rin 25 in that it has an inner beveled helical ace to seat on-the beveled helical wall of the groove, and a small section 36 which is wedge-shaped in cross-sectionand *seatson the beveled outer face of the large section projectin outwardly beyond the outer face thereo to contact the cylinder wall. This small section 36 is preferably of larger cross-sectional area than the rtion that would be removed from the lank from which the large ring section 35 ing ring counter the helical side wa dially a packing ring, a paeking ring d1sresponding to the tions illustrated in modified forms of my construction.

My packing, therefore, while held under e piston and the piston is held to travel in 36 in addition to the expansible pressure to fit the bore of the cylinder, yet seats at all times firmly upon t the cylinder without wobble or piston slap and its movement is stabilized..

What I claim is: 1. 'In piston packing, a pistonprovide with a packing groove having an outwardly beveled helical wall, a packing ring in saidgroove having a. helical beveled face contacting said wall so that the ring is supported axiallyand radiall thereon.

2. In piston pac ing, a piston havin a groove for packing provided with a hehcal outwardly beveled side wall, a ring in said groove having a helical beveled inner face movably seated on the wall of the groove.

3. In'piston packing, a piston having a packing groove provided with an inclined side wall which extends angularlyradially circumferentially relative the opposite side wall, a packing ring movable in'sai'd groove. having aninner face inclined .to correspond with the inclinedside wall of the groove and seatedthereon.

4. In piston packing, a piston havin a packing groove provided with a hehcal outwardly beveled side wall portion,a packing ring rotatable in'said groove having a helical beveled inner face seating on the beveled wall of the groove, said ring held under constraint rotatably.

5. In piston packin a' piston provided with a packing groovella lar side wall andan'outwardly, beveled helical opposite side wall, packing in said groove comprising a ring havin a helical beveled inner face sup rted on t e. beveled wall of the groove, an a spring member in the groove exerting -rotatable .pressure on the mug.

6. In piston packing, a piston provided with a packin groove having a beveled to support axially and raposed within the roove having a face corveled helical wall of the groove and supported thereon to substanving a plane circutiall fill the groove axially and extend outbeyondthe surface of the piston.

piston packing, a piston prov ded with a packing groove having an lnclmed helical side wall, a packing ring in said groove having an inclined helical inner face seating on the inclined side wall of the groove to support the ring axially and radially within the groove, which ring is of such across-sectional area as to substantially fill the groove and extend outwardly radially beyond the piston", and means engaging 'the ring to exert rotatable pressure thereon. 8. In piston packing, in combination with a cylinder, a piston movably disposed therein having a packing groove provided with a rigid helical beveled supporting face for packing, a packing ring in said groove having a helical beveled face seated on the helical beveled supporting face in the groove held outwardly against the cylinder wall and under restraint to produce rotation within the groove.

In testimony whereof, I sign this speci- 20 fication.

' JOHN F. PANYARD. 

